Thunderbirds have special ability lightning strike, which has 20% probability to occur after the stack have attacked, including retaliations. When the stack attacks, the lightning strike occurs before the enemy has chance to retaliate. If successful, the lighting strike deals additional damage for the amount of ten times the number of attacking Thunderbirds. The thunderbolts have the same visual effect as the spell Lightning Bolt, and the special attack is also counted as one in terms of immunities.